Insulator-supporting pin.



C. L. PEIRCE, JR.

INSULATOR SUPPORTING PIN.

APPLICATION FILED MAY 4, 1914.

Patented Mar. 7, 1916.

0. 9 0 4 4 2 P Q u lll I.l\|\l|\x m ll 0 0 20 M6 1 4 7 4 7 4. 15 v 4 4 0 1 1 H\ IIUI HHH 0 l A TTORNE YS.

WITNESSES THE COLUMBIA PLArjoGRAPH :0. WASHINGTON, D. c.

* 'rntrns ra'rnr are.

CHARLES" L. names, .13., or PITTSBURGH, PENNSYLVANIA.

INSULATOR-SUPPORTING PIN.

Specification of Letters Patent.

Patented Mar. '7, 1916.

Application filed May 4:, 1914. Serial No. 836,114.

To all whom it may concern: 7

Be it known that I, OHAnLEs L. PEIRGE, J12, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have inventedcertain new and useful Improvements in Insulator-Supporting Pins, of which the following is a specification.

My invention relates to improved insulator supporting pins particularly adaptable for supporting heavy wires or cables.

Such pins have heretofore been made in several parts, one structure which is in con- Y siderable use at the present time comprising a cast standard through which a bolt extends to be engaged at its upper end by a thimble and at its lower. end by a bolt, the standard or pedestal being clamped between the cross-arm and the thimble when the structure is in service. The standard'and the thimble being both cast there might be burs or other irregularities'on the engaging surfaces and such surfaces will be far from fitting uniformly and evenly together, the result being that the weakest spot will be at the juncture of the standard and thimble and the bolt will bend at that point.

Among the important objects of my invention is to forge the pin, including a body part, base, and shank integrally of steel, and another important feature of the invention resides in the improved connection of the thimble with the pin body in order to get the effect of a solid integral structure whose strength is uniformly distributed.

In accordance with my invention the top end section of the body is reduced in diam eter to form a neck which is threaded to receive the thimble, and the shoulder between the neck and body part is conical, the thimble mouth being internally conical to snugly fit the conical shoulder when threaded to the neck, the conical surface of the shoulder, by the forging operation, being smooth and true and requiring no finishing. With this arrangement the thimble is as intimately secured to the pin body as though it were an I integral part thereof and the strength of the resulting structure will be uniformly distributed and any tendency to bend at any part, as for example between the thimble and body, will be eliminated.

My improved structure and its features will be clearly understood by reference to the accompanying drawing in which- Figure 1 is a front elevational view of the pin structure, and Fig. 2 is an enlarged front base 11 from which extends downwardly and co-axially with the body 10 the shank 12 threaded at its lower end for receiving a nut 13, the cross-arm through which the shank 12 passes being clamped between the nut and the base. At its upper end the body part has the reduced threaded neck section 14 and between this neck section and the body 10 is the conical shoulder 15. The body, base, shank, neck and shoulder are forged integrally from metal, preferably steel, the body 10 being of sufficient diameter and the base 11 being of sufficient width and thickness to adapt the structure particularly for heavy service.

The threaded neck lt receives the threaded bore of a thimble 16 which may either be forged or cast integrally. This thimble has the skirt 17 integral therewith whose interior surface 18is conical to fit the conical shoulder 15 when the thimble is screwed down. As the supporting structure is forged the shoulder 15 will have a smooth and finished conical surface so that the thimble conical surface will ,snugly and uniformly engage therewith, the thimble then fitting intimately and closely all over to give the effect of a solid integral structure, the strength being substantially the same as though the thimble were an integral part of the support body 10. In fact, the thimble could be forged integrally with the body were it not for the fact that for heavy service thimbles are cemented into the insulators and must therefore be separable from the supporting pin. The thimble is therefore provided with transverse and longitudinal grooves 19 and 20 in which the cement may engage to more securely fasten the thimble in the insulator.

The structure disclosed is substantially of uniform strength throughout. There are no heavy body 10 with the Wide base 11 integral therewith and integral with the shank 12 gives a very'stifi and rigid support, the structure being particularly adaptable for heavy work involving the support of heavy conductors or cables.

I do not, of course, desire to be limited to the precise construction and arrangement shown, as changes may be possible which would still come within the scope of the invention.

I claim the following:

An insulator supporting structure forged integrally and comprising a heavy cylindrical body part terminating in a flaring base,

a shank extending downwardly from the base for engaging with a cross arm, the upper end of thebody being of reduced diameter and threaded, a short conical section between tlie body part and reduced threaded end, and an insulator supporting thimble having a threaded bore and a long skirt for intimately engaging the threaded end and conical section respectively.

In Witness whereof, I hereunto subscribe my name this 27 day of April, A. D. 191 CHARLES L. PEIROE, JR. lVitnesses:

CHARLES J. SCHMIDT,

S. B. CARR.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents, Washington, I). C. 

